Carriage escapement mechanism.



PATENTED NOV. 19, 1907.

- w. P. KIDDER.

CARRIAGE ESGAPEMENT MECHANISM.

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APPLICATION FILED JUNE 24.1905.

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PATENTED NOV. 19, 1907.

w. P. KIDDER.

CARRIAGE BSGAPEMENT MECHANISM.

APPLIOATION FILED JUNE 24.1905.

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WITNESSES: N TO]? I 5 Ka eb-.1

BY A

' ATTORNEY UNITED STATES PATENT canton.

WELLINGTONPARKER KIDDER, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO PARKER I MACHINE COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

CARRIAGE E SCAPEMENT MECHANISM.

Specification of Letters Patent.

Patented Nov. 19, 1907.

Application filed one 24, 1905- Serial No. 266,813-

To all whom. it may concern:

Be it known that I,- WELLINGTON PARKER KIDDER, residing at Boston, in the county of Suffolk and State of Massachusetts, have vented certain new and useful Improvements in Carriage Escapement Mechanism for Type-Writers, of which the following is a full, clear, and exact description, such as will means whereby the machine will operate without noise.

A further object is the provision of escapement mechanism for the carriage feed of positive and I reliable action and so constituted as to operate silently.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combmatlon of elements and, arrangement of parts which will be exemplified in the mechanism hereinafter describe and the scope of the application of whichv will be indicated in the following claims.

In the accompanying drawings, ,wherein is illustrated one of the several possible embodiments of my invention, Eigure 1 is an elevation partly in section of a portion of a typewritin machine showing my invention.

Fig. 2 is an end elevation of the same.

Similar reference characters refer to similar parts throughout the several views.

As tending to render better understood certainof the various general features of my invention it may here be noted that in typewritingmachines of the above type wherein a silent operation is sought, it is essential that the carriage feeding mechanism be so constructed as to operate as noiselessly as possible. For this reason I have found it desirable in machines of this type to provide an escapement mechanism for the carriage feedso constructed as to ehmlnate concussion or. impact of movable parts, thereby insuring a substantially silent opera-tion. The above and other advantages are secured in constructions of the nature of that hereinafter pointed out.

Referring to the drawings, the carriageC is provided with a rack 1 and is constantly urged to longitudinal movement by the driving spring or other actuating device not herein shown as it forms no part of my present invention. Shaft 2 suitably journaled in the frame is provided at one end with a pinion 3 enga ing with rack 1 and atits opposite end wit an escapement-wheel 5 hav-' mg a series of axially arranged teeth 6 adapted to co-act with escapement devices hereinafter described. A rocker block 7 carried by shaft 8 suitablyjournaled between brackets Qand 10' secured to the frame of the machine is provided with a fixed dog 11' and a movable dog 12 pivoted at 13 to block 7,

said dogs 11 and 12 constituting the escapementmeans for escapement-wheel 5.

Horizontal shaft 14 connected to the usual universal bar 15 by means of link 16 and le ver arm 17 carries a crank arm 18 to which is pivoted at 19 a link 20 ivotally secured to rocker-block 7. Rockerlock 7 supports a wiper-cam 21 pivoted at 22 which is in constant engagement'with escapement dog 12 and this cam is connected to piston 23 operating in dash-pot 24 by means-of piston rod 25. Pivoted escapement dog 12- is normally in engagement with one of the teeth of escapement-wheel 5 but is adapted to be disengaged therefrom by a swinging of rocker block 7 against the tension of spring 26 attached to said block 7 at 27 and to an adjusting screw 28 tap ed into the frame in the machine. Upon t e disengagement of the escapementdog 12 from a tooth 6:0f escape-v ment wheel 5, fixed escapement'dog 11 is ad& ted to simultaneously engage with said toot to prevent a rotation of escapementwheel 5. Spring 29 attached to rocker-block 7 and to piston 23 is adapted through pistonrod'25 and wiper-cam 20 to swing escapement dog 12 on its pivot when the same is disengaged from escapement wheel 5 to a position adjacent a .succeeding tooth of escapement-wheel 5 as shown in the dotted lines of Fig. 1'.of the drawings, such movement being arrested by a cushioned-stop 30 positioned upon rocker-block 7. The operation of the above described escapement which after such description should be to a large extent obvious, is substantially as follows: In order that the samemay be more conveniently described, I have designated by a: the axially arranged tooth which is in engagement with the escapement device as shown in Fig. 2, the succeeding tooth being designated by y. When the universal bar 15 is actuated by the pressure of a key-lever or spacing mechanism thereby rocking shaft 14, crank-arm 18 causes link 20 to rock block 7 laterally to disengage movable escapement dog- 12 from tooth a: of escapement wheel 5, said escapement dog and said tooth being normally in engagementas hereinbefore explained. Fixed escapement dog 11 is,however, simultaneously engaged with said tooth and the rotationof escapement wheel 5 is prevented. Escapement dog 12 thus beingreleased, spring 29 acting through piston 23, piston-rod 2 5, and wiper-cam 21 causes-the sameto swing on its pivot to a position in proximity to the succeeding tooth y in which position further pivotal movement is arrested;by means of cushioned stop 30. l Vhen pressure on universal bar 15 is released,

spring 26 forces rocker block 7 to its normal position,fixed escapement dog 11 being thereby disengaged from tooth m ofescapementv wheel 5 and-pivoted esca ement dog 12 simultaneously engaged wit 1 succeeding tooth y. Escapementdog 12 being free to swing upon its pivot, and escape/ment wheel 5 by reason of its constant tendency to rotate un der the influence of the power-driven carriage as above explained,.causes a movement of said escapement dog 12 and wiper-cam 21, such movement being yieldingly resisted by the air-cushion in dash-pot 2 1, cam 21 operating to silently arrest such movement when the position shown in the full lines of Fig. 1 is reached and, cushion 24 in'dash-pot 24 serves as a cushion for piston 23. The rotation of the escapement wheel has allowed the carriage to be fed toan extent equal to the distance between'two adjacent teeth of rack 1. it will be noted, however, that the escapement wheel isof greater diameter than the feed pinion, and that accordingly theteeth of the escapement wheel are separated by greater spaces than are the teeth of the feed pinion or the rack. Therefore during the movement of rack 1 for a given distance, the teeth of the escapement wheel will have traveled a relatively greater distance, thus providing'a longer sp'acewithin which the devices employed to resist and finally stop the escapement Wheel can act.

It will thus be seen. that I have constructed a feeding device for the carriage of typewrits 'ingvmaohines which is well adapted to attain the objects sought and which is also characterized by efficiency and simplicity. co-acting teeth ofv the escapement wheel en gage the escapement devices without impact The srnaso or concussion and the impulse of said escapement wheel is yieldingly resisted or opposed by the air-cushion in the dash-pot, such movement being ultimately arrested by the Wiper-cam. Cushion 30 operates to stop without noise the movement of pivoted escapement dog 12 pre aratory to. its engagement with a succee ing co-acting tooth of escapernent Wheel 5.

While I have shown my invention applied to a typewriting machine of the above type, I do not wish to be understood 'as being limited exclusively to such type. of machine it being adapted as to many of its features to machines of other types, although oI-peculiar value in the relation sh'o Wn.

As many changes could be made in the above construction and many apparently widely difi'erent'embodiments of my invention could be made without departing from the scope thereof, I intend that all matter contained in the above description or s-houn in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I desire it also tobe understood that the language used in the following claimsis intended tocover all of the generic and specific features of the invention herein described and all statement of the scope of the inven- --tion, which, as a matter of language, might be said to fall therebetwee'n.

'1. In a typewritin'g machine, the combination uitli a power driven carriage, of a rack carried thereby, a shaft carrying a feed pinion and an escapement wheel, the former of which meshes w ith said rack, escapement mechanism comprising a fixed and a lnovrocker member carrying the escapementmechanism comprising a fixed and a mov-; cable dog adapted to, cooperate with the escapement wheel to all'ord a feed of the car riage, and a member held incontact with the movable dog adapted yieldingly to resist the movement thereof when the same is thrown into engagement with the escapement wheel, said member being also adapted to arrest the movable dog without impact or concussion at the end of its movement.

3. In a typowriiing machine, the combination with a powendriven carriage provided with the usual feed rack,of, a shaft carrying a feed pinion and an escapement wheel, the

former of which meshes with said rack, a

rocker member, escapement mechanism comprising a fixed and a movable dog mounted on 831d rocker member, said escapement mechamsm cooperating with the escapement wheel .to afford a feed of the carriage, and a ion being in mesh with therack, eseapement mechanism comprising a fixed dog and a swinging do" which 006 erate with the escapem'ent wlieel to afi'or a feed of the carriage, a rocker member carryin said feed dogs, and'a wiper cam engaging t e movable dog'adapted-to ieldingly oppose the movement thereof w en the same is swung into engagement with the escapementwh'eel and also adapted to arrest the movement of said dog at t e end of a letter spacing movement of the carriage.

5. In a typewriting machine, the combination-with a power driven carriage, of a rack carried thereby, a shaft carrying a feed pinion and anesca ement wheel, the'feed pinion being in mes with the rack, escapement mechanism comprising a fixed dog and a swinging dog adapted to cooperate with the escapement wheel to afi'ord'a feed of the carriage, a rocker member carrying said feed dogs, a wiper cam pivotally mounted upon said rocker member and held'in impos1t1ve engagement with the movable dog, said cam being ada ted yieldingly to resist the movement of the movable dog when the same 1s swung into engagement with the escapement wheel, a dashpot, and aconnection between said cam and the piston of said dashpot.

6. In a typewriting machine, the comblnation with a power driven carriage, of a rack carriedthereby, a shaft carrying a feed p nion and an escapement wheel, the feed p111- ion ,meshing with the rack, escapement mechanism comprising a feed dog and a holding dog, the latter normally restraining the movement of the escapement wheel, a rocker member upon which said dogs are mounted, a cam pivotally mounted upon the rocker member and held in engagement with the movable dog, said-cam being adaptedyieldingly to o pose the movement of the feed dog when t 1e same is thrown into engagement with the escapement wheel, a dashpot, a )iston located in said dashpot and connecte' with said cam, and'spring means adapted to return the feed do 'to normal position when the same is thrown from engagement with the escapement wheel. i

In testimony whereof I aflix my signature, in the presence of two witnesses.

WELLINGTON PARKER KIDDER.

Witnesses;

R. WHITE, 0. H. WILSON. 

